Jean Cenede BI Day June 10 th 2016 on behalf of Electron Cooler team 1 Map Presentation Electrons Cooling generalities Electron Cooler at CERN ELENA ECooler ID: 639391
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Slide1
ELENA – Electron Cooler
Jean Cenede BI Day June 10th 2016
on behalf of Electron Cooler team
1
Map Presentation :
Electrons Cooling generalities
Electron Cooler at CERN
ELENA E-Cooler
E-Gun & Collector
Slide2
What‘s a Electron Cooling
BI Day March 10th 2016
Means
to increase the phase space density of a stored ion beam.
Mono-energetic
cold electron beam is merged with ion beam which is cooled through Coulomb interaction
.Electron beam
is renewed and the velocity spread of the ion beam is reduced in all three planes.
2
Slide3
Concept
overview of a E-cooler
e-Gun
e-Collector
Circulating Beam
Electron
Beam
BI Day March 10th 2016
Circulating
Beam
Cooled
3
Solenoïd
DriftSlide4
BI Day March 10th 2016
Low
velocity
Electrons Source :
The E-GUN final current given by Child’s Law:
I = µ .V3/2A set of Magnetic circuit : Expansion Solenoïd, Drift, Toroids, Squeezes coils …. (Used to transport the electrons Beam)A Electron Anode Recuperator : The COLLECTOR Electron Cooler system is composed of :
4
Slide5
Cooling effects
on Beam viewed by
E-cooling
Acceleration
BI Day March 10th 2016
Beam
Ionization
Profile Monitor
(LEIR Vertical datas acquisitions :
A.Frassier
)
Schottky Monitor
(
Beam
Revolution
Frequences
)
5
Slide6
CERN’s Electron Cooler : AD and LEIR
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6 Slide7
Location
Soon in ELENA Ring
4th Section
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7 Slide8
Concept overview
of Vacuum ElementsVacuum systemGun & Collector
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8
Gun
Collector
Vacuum
ChamberSlide9
Concept
overview
of Magnets Elements
Magnets
Supporting
system
9
ToroidSlide10
Toroid Assembling details
10
3D Printing Simulations
Assembling
Sequences
Slide11
Beam
Specifications : I e- : 1/5mAU e- : -55/-355 V No High Voltage Cage
ELENA E-COOLER Power DiagramBI Day March 10th 2016
Momentum
35 MeV/c13.7
MeV/cPbar-beam energy648
keV100 keVE-beam energy355 eV55 eVI e5 mA2 mABgun1000 GBdrift
100 GToroid bending radius0.25 mCathode radius8 mmE-beam radius25 mmCooling drift length1.0 m
11 Slide12
Gun
& Collector Design
Gun and collector design optimization performed with EGUNBI Day March 10th 2016
12
(I
= µ .V3/2 )Slide13
Gun and Collector
Specifications : (Inspired
by : AD, LEIR E-COOLER & FERMILAB design )Adapted to cathode design, electricals, thermals requirements Differents electrodes
with differents
forms, positions & voltages
Modularity for eventuality modifications
XH-Vacuum : 10-12 mmbHight temperature Back-out : 200 to 300°
BI Day March 10th 2016
13 Slide14
Cathode
Assembly Concept overview
Support Cathode Cathode :(Provider SAES Getters)Pierce Electrode
BI Day March 10th 2016
14 Slide15
Gun
Concept overview(on CDD: AD_NECGA%)
Gun Flange (DN160CF + SHV + Fil. connector )Cathode Assembly Grid ElectrodeAnode Electrode Each Potential is separate by ceramic IsolatorSleeve & Elastique compress ring (total : 135mm height)
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15 Slide16
Gun to Collector
Design
Gun and collector design optimization performed with COMSOL Multiphysics (G. TRANQUILLE)
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16 Slide17
Collector Concept
overview(on CDD : AD_TER% dimensions Ø 314 x 455mm)
Collector (Anode)Ceramic IsolatorReppeler ElectrodeCeramic IsolatorCollector flange (DN200CF)
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17 Slide18
Bake Out Brazing Stress
Simulation modification & validation(ANSYS by EN-MME)
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18 Slide19
GUN & COLLECTOR :
Ready
E-COOLING Assembling in the midle of ring ELENA Connecting E-COOLER to ELENA ring Planning ELENA Electrons-COOLER
2015Today
2016
2017
BI Day March 10th 2016
I hope it will live Happily !!!!
19 Slide20
ELENA E-cooler
Gun configuration on a lovely Test
bench for validation.
20 Slide21
Soon
ELENA E-COOLER Gun Beam tests(Test
bench bat 236: Started by R.Sautier)
21 Slide22
Thanking to
Electron
Cooler team :
Gerard Tranquille
Alexandre Frassier
Lars
Soby Lars Varming J. Marc Timmins Antti Juhani K. Alejandro Carlon Z.Benjamin Moles BE BIBE OP
EN MME
22 Slide23
That’s All For Now
BI Day March 10th 2016
Next
step for E-COOL Team :
A new E-COOLER for AD-RING for LS2
23 Slide24Slide25Slide26
The magnet system
Magnetic system components
Main cooler solenoidGun solenoidCollector solenoidExpansion solenoidSqueeze coil at collector2 x Toroid section consisting of 9 racetrack coils eachVarious corrector coils to ensure good field qualityOrbit correctorsSolenoid compensatorsSlide27
Fine tuning the fieldSlide28
Beam
Ionisation
Profile Monitors
Bottom Electrode
MCP
Top Electrode
Readout
e-
Ion +
e-
Residual Gas
Vaccum Chamber